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A093943 Primes of the form 8*10^k + 7*R_k, where R_k is the repunit (A002275) of length k. 1
877, 8777777777, 8777777777777777, 877777777777777777777777777777777, 877777777777777777777777777777777777777, 877777777777777777777777777777777777777777777777777777777777777777 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
Table of n, a(n) for n=1..6.
Makoto Kamada, Prime numbers of the form 877...77.
Index entries for primes involving repunits
CROSSREFS
Cf. A002275, A056724 (corresponding k).
Sequence in context: A208787 A208587 A208472 * A252437 A129313 A063051
Adjacent sequences: A093940 A093941 A093942 * A093944 A093945 A093946
KEYWORD
nonn
AUTHOR
Rick L. Shepherd, Apr 17 2004
STATUS
approved

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Last modified June 10 09:51 EDT 2024. Contains 373259 sequences. (Running on oeis4.)